> do you not feel they have a responsibility to be fair, reliable and trustworthy?

What an odd question. Of course not. You've built your business on their platform and you've (for lots of non-specific, general "you"'s) decided to cede your business to their whims. Plenty of businesses exist just fine with no social media presence and plenty of people are not too brain-rotted to find them.

But more to the point, I don't feel Meta has any responsibility to anyone. I feel the government in my country has a responsibility to regulate them and to levy devastating and potentially existential fines if they break those regulations. It's absurd to think these companies have any obligation to you (you in general, not you specifically) just because you can't figure out how to function without them.